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Old 05-10-2014, 01:13 AM   #1
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Transmission question - whirrrrr

My transmission started making a whirring noise when the clutch is engaged and is really loud in 1rst and 2nd gear. Even when the clutch is engaged in neutral and it's idling I can hear the whirring noise, almost metallic whirring noise. SO using logic and google I've decided it might be the front main bearing in the transmission. It hasn't always made this noise I've seen so many people say it's a normal noise, well it's not, it started maybe 10k ago and it's annoying.

My question is, has anyone ever replace the front main bearing on an nv3550? Can it be as simple as pop off/pop on? (Never mind dropping the trans). Or do you have to tear the whole thing apart pretty much? Can't find it anywhere.

2000 jeep tj 4.0L 5 spd manual

Oh and the clutch/flywheel/throw out bearing is brand new as of about 10k ago.

Thanks for any input

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Old 05-10-2014, 01:43 AM   #2
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Download a free fsm from jeepslimited.com you have to register. It's legit 0 bs emails I think your suspicion is correct. I've done a clutch. Yours sounds nothing like that. I videoed pulling the tranny on you tube. To do my clutch. Never played with the bearing. If it helps you. http://youtu.be/BS4abyp0zfk

Good luck brother.

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Old 05-10-2014, 03:05 AM   #3
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If your noise started 10k miles ago and your clutch was changed 10k miles ago I would suspect something that was touched. It could be a throwout bearing... just my 2 cents....
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Old 05-10-2014, 11:12 PM   #4
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Originally Posted by DRiFT junkie View Post
If your noise started 10k miles ago and your clutch was changed 10k miles ago I would suspect something that was touched. It could be a throwout bearing... just my 2 cents....
Only reason I know it's not the throw out bearing is because my clutch didn't crap out on me 10k ago, my throw out bearing did, so I know what that sounds like lol, much more unpleasant sound than this one for sure, louder too.
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Old 05-10-2014, 11:24 PM   #5
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Originally Posted by Majnoon View Post
Download a free fsm from jeepslimited.com you have to register. It's legit 0 bs emails I think your suspicion is correct. I've done a clutch. Yours sounds nothing like that. I videoed pulling the tranny on you tube. To do my clutch. Never played with the bearing. If it helps you. Jeep Clutch Repair on a 2000 Jeep Wrangler 4.0 / Transfer Case Removal Walk Though - YouTube

Good luck brother.
I didn't know how close the throw out bearing and pilot bearing is, but some clutch kits come with both, I will go back to my mechanic and ask him if he changed the pilot bearing when he did the clutch and if he did well then guess it's just screwed itself again, crap. Oh well we will see
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Old 05-12-2014, 12:08 AM   #6
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The pilot bearing only moves with the clutch disengaged. I'd stick with your original thought. Good luck.
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Old 05-12-2014, 09:36 AM   #7
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We just got through replacing an input shaft bearing on the front of an AX15, and I am fairly certain that they are at least similar. On the AX15 most of the transmission has to be torn down because the counter shaft gear locks the input shaft into place. It's not a terrible job, you just need to be organized, (take some pics is a good idea) get a factory service manual, and keep track of all parts. Here's a few pictures of how far down we took ours.

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